New HP Elitedesk 800 G1 - no wireless adaptor?

I have a brand new HP EliteDesk 800 G1 small form factor PC running Windows 7 - code H5T99EA. It doesn't appear to have a wireless adaptor - certainly none shows up in the Harware Profile. 

I can only connect to the Internet via ethernet cable. I get no option to connect via wireless and my wireless router is not discovered when I try (nor are any other local wireless access points.

Do I need to download a driver for the wireless adapter - presumably there is one installed?

Thanks

John